Răspuns :
x-pretul initial
10% din x= 10/100 * x= 1/10 * x= x/10 -scumpirea
x+x/10 = (10x+x)/10= 11x/10 - noul pret
11x/10 = 55
x=10*55/11
x=10*5
x=50 lei
10% din x= 10/100 * x= 1/10 * x= x/10 -scumpirea
x+x/10 = (10x+x)/10= 11x/10 - noul pret
11x/10 = 55
x=10*55/11
x=10*5
x=50 lei
110%...............55 lei
100%.................... x lei
_______________________
x=100x55/110
x=50 lei
100%.................... x lei
_______________________
x=100x55/110
x=50 lei